Jambs h



gleiten taten datent @fitta JAMES H. MURRILL, OF BALTIMORE, MARYLAND.

Letters Patent No. 62,874, dated film-ch 12, 1867. l

IMPROVEMENT IN VALVE-GEAR FOR OSGILLATING lihlGrIhllEiS.

TO ALL-WHOM IT MAY CONGERN:

Be it known that I, JAMES II. MURRILL, 'of the city and county of Baltimore, andState of Maryland, have invented certain new and useful improvements in Oscillating Steam Engines; and I do hereby declare that the following is a full,.clear, and exact description ofthe same, reference being had to the accompanying drawings, forming apart of this specication, of which- Figure 1 is an elevation.

Figure 2 is a. sectional view.

Figure 3 is a modification. y y

My improvement consists in preserving the simplicity ofthe slide-valve arrangement of thestationary engine, and applying it to a steam engine, in which the cylinder is reciprocating. It further consists in giving the means fo'r the advance or lead to the valve, and cor-.trois the admission of steam into the cylinder when the crank is at its dead-point or in line. y

Th'e rst of these objects being accomplished by hanging the cylinder A on plain hollow t'runnions, b b. Through one of them steam is passed into the steam chest c, placed .on the side of the cylinder, between it and the trunnion, and through the other trunnion the exhaust steam is allowed to escape. `The valve is of the ordinary slide character, and may be situatcdvat'the centre ofthe cylinder, or the valves may be double, and at leach end ofthe same. In'the rst oase, a single steam chest and valve is shown in the drawings, and in the second case a valve-rod connecting the two valves may be employed. dis the valve-rod. e is an arc or segment, which is secured on a vibrating lever, D, said lever havingits centre of motion on one ofthe trunnions. 'E is an eccentric on the crank-shaft, I". The valve-rod el is provided with two studs, (orvslixle blocks,) embracing the arc'e between them. The arc e partakes of the side movement of the vibrating lever D. It is secured on said lever at any desired position by set-screws or clamps, having a centre holt. a, on which it may be moved. The arc c boing movable, instead of fixed, will Form a distinct application for Letters Patent. The other improvement is the use orf the eccentric E, which, 'operating on'and with the arc and lever D, is the means I employin giving lead to the valve in advance of the movement effected by the crank. By it I open, inl'as slight a degree as may be desired, the valve, and admit steam behind the piston; for example, when the crank is up or down, or in line with the cylinder,'the eccentric throws the lever either to the right or left ci' said line, and as it carries with it4 the arc the stud-pins of the valve-rod embracing the are cause said rod to move slightly in advance of the move-` ment effected by the crank, and thus open the valve for a gradual admission of steam, the full movement of the valve being accomplished by the crank causing the studs of the valve-rod in the oscillation ofthe cylinder to pass up and down on the arc or circular incline. Any degree or throw of the valve may be effected by the eccentricitythe are may be made to assume to the centreof its motion, viz, the trunnion.

Having described my improvement in steam engines, what I claim as my invention, and desire to secure by Letters Patent., isf- The arrangement of the-arc e, lever D, valve-rod d, crank-shaft- F, and oscillating cylinder A, substantially as described. as and for the purposes set forth.

In testimony whereof' I have hereunto signed my name before two subscribing witnesses.

JAS. H. MURRILL.

Witnesses:

JOHN F. CLARK, r Lewis R. KEIZER. 

